I do the same. I never used bookmarks much, but when I did to remember rare findings, the website was already gone.

I now use 'save page as' (in Firefox I actually use https://addons.mozilla.org/en-US/firefox/addon/mozilla-archi...) all the time.

Unfortunately, JS-heavy pages might still perform delayed loading of resources which MAFF doesn't handle, which is one of the many reasons I truly hate how "modern web technologies" are abused.